Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 52: Oxide Semiconductors II
HL 52.7: Talk
Thursday, March 20, 2025, 16:45–17:00, H14
Investigation of the bond length dependence and lattice relaxation in zincblende Cu(Br,I) alloys — •Sandra Montag1, Stefan Merker2, Michael Bar1, Richard J. Schenk1, Eva Zollner1, Konrad Ritter1, Timo Pfeiffelmann1, Sergiu Levcenko1, Edmund Welter3, Holger von Wenckstern1, Marius Grundmann1, Harald Krautscheid2, and Claudia S. Schnohr1 — 1Felix Bloch Institute for Solid State Physics, Leipzig University, Germany — 2Institute of Inorganic Chemistry and Crystallography, Leipzig University, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
CuI is a promising p-type wide-bandgap semiconductor with various applications in the field of transparent electronics. Among the numerous doping and alloying candidates, the Cu(Br,I) alloy system offers the opportunity to tailor the free hole concentration in functional layers, enabling optimized performance of active devices, such as pn-diodes and transistors. Using X-ray absorption spectroscopy, the fine structure of CuBr1−xIx powder and thin film samples, with anion composition x varying from 0 to 1, was measured. The analysis of the extended fine structure reveals a nonlinear change of the Cu-Br and Cu-I bond lengths with composition x. This behaviour is different from that reported for III-V and II-VI zincblende alloys, but comparable to the rocksalt RbBr1−xIx alloy. The observed bond length bowing may therefore be a characteristic feature of group I-VII alloys. To uncover the degree of lattice relaxation with increasing distance from the absorbing atom, the higher neigbour scattering signal is evaluated.
Keywords: transparent semiconductor; alloy; copper halide; x-ray absorption spectroscopy; bond length